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            <h2 class="title" style="clear: both"><a id="upgrade_3_3_memp_fget"></a>memp_fget, EIO</h2>
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      <p>Previous releases of Berkeley DB returned the system error EIO when the
memp_fget function was called to retrieve a page, the page did not
exist, and the <code class="literal">DB_MPOOL_CREATE</code> flag was not set.  In the 3.3
release, the error <code class="literal">DB_PAGE_NOTFOUND</code> is returned instead, to
allow applications to distinguish between recoverable and
non-recoverable errors.  Applications calling the memp_fget function
and checking for a return of EIO should check for
<code class="literal">DB_PAGE_NOTFOUND</code> instead.</p>
      <p>Previous releases of Berkeley DB treated filesystem I/O failure (the most
common of which the filesystem running out of space), as a fatal error,
returning <a href="../programmer_reference/program_errorret.html#program_errorret.DB_RUNRECOVERY" class="olink">DB_RUNRECOVERY</a>.  When a filesystem failure happens in
the 3.3 release Berkeley DB returns the underlying system error (usually EIO),
but can continue to run.  Applications should abort any enclosing
transaction when a recoverable system error occurs in order to recover
from the error.</p>
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